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Flak Definition & Meaning - Merriam-Webster
8.8 cm Flak 18/36/37/41 - Wikipedia
What happened to all the flak fired at aircraft during World War II
Anti-aircraft warfare - Wikipedia
How Nazi Germany Introduced the FLAK Into the Military Lexicon
Flak division - Wikipedia
Entering the Flak Barrage | War History Online
Flak 36 88mm Multipurpose Gun - National Museum of the USAF
War of Words – ‘Flak’ - Military History Matters
For Allied Planes and Tanks, Germany's 88mm Flak Gun